WASHINGTON — Six months after opening, MGM National Harbor continues to generate the lion’s share of gambling revenue among Maryland’s six casinos, and it appears to be coming at the expense of Maryland Live! at Arundel Mills.

Maryland Lottery and Gaming says the state’s six casinos generated a total of $130.5 million in gaming revenue in June, down from $136.5 million in May. The total figure was still up nearly 40 percent from June of last year.

When MGM National Harbor, which opened in December, is excluded, total gaming revenue from the other five casinos was down 13.9 percent from what they generated in June of 2016.